Abstract:
A variable venturi down-draft carburettor comprises a unitary casting (1) which defines an induction passage (2), and upwardly open cavities constituting a float chamber and a recess in which a movable venturi member (15) is housed. A throttle valve (30), main jets (12,13) and venturi members (15) are all housed wholly within the confines of the casting (1), and the casting is covered by a single plate (40) which closes the upwardly open cavities and defines an inlet orifice (41) to the induction passage (2). By housing the throttle valve (30), main jets (12,13) and venturi in one unit operation of the carburettor is unaffected by variations in the cover plate (40) produced by manufacturing tolerances. Access to the interior of the carburettor is achieved by removal of the plate (40) which does not, in itself, affect the adjustment of the carburettor. The casting preferably includes integral mountings for a vacuum motor, and/or acceleration pump, and/or an automatic choke.
Abstract:
A variable venturi down-draft carburetor comprises a one-piece unitary casting (1) that defines an induction passage and upwardly open cavities constituting a float chamber (3) and a recess (4) in which a movable venturi member (15) is housed. A throttle valve (30), main fuel jet (13), and ventury member are all housed wholly within the confines of the casting, and the casting is covered by a single plate (40) that closes the upwardly open cavities and defines an air inlet orifice to the induction passage. By housing the throttle valve, main jet and venturi in one unit, operation of the carburetor is unaffected by variations in the cover plate produced by manufacturing tolerances. Access to the interior of the carburetor is achieved simply by removal of the plate, which does not, in itself, affect the adjustment of the carburetor. The casting preferably includes integral mountings for a vacuum motor (23), and/or acceleration pump (86), and/or an automatic choke (51).
Abstract:
Ein Vergaser besitzt ein Gehäuse (18), in dem eine Steuerwalze (22) drehbar gelagert ist. In dem Vergaser ist ein Abschnitt (25) eines Ansaugkanals (21) ausgebildet. In der Steuerwalze (22) ist ein Teilabschnitt (27) des Ansaugkanals (21) ausgebildet. Die Steuerwalze (22) steuert den freien Strömungsquerschnitt des Ansaugkanals (21). Der Vergaser (11) besitzt eine Kraftstoffkammer (28). In den Teilabschnitt (27) des Ansaugkanals mündet eine Kraftstofföffnung (19), die über einen unverzweigten Kraftstoffkanal (29) mit der Kraftstoffkammer (28) verbunden ist. Ein einfacher Aufbau des Vergasers wird dadurch erreicht, dass der Vergaser (11) ein elektrisch betätigtes Ventil (30) umfasst, das den Kraftstofffluss durch den Kraftstoffkanal (29) steuert. Für ein Verfahren zum Betrieb eines Verbrennungsmotors mit einem Vergaser (11) ist vorgesehen, dass vor oder beim Starten des Verbrennungsmotors eine Temperatur (T) ermittelt wird und dass der Kraftstofffluss durch den Kraftstoffkanal (29) beim Starten des Verbrennungsmotors in Abhängigkeit der Temperatur (T) gesteuert wird.
Abstract:
PROBLEM TO BE SOLVED: To improve to obtain positive starting in a working machine driven by an internal combustion engine and manually operated. SOLUTION: This carburetor device is provided with a carburetor 1 for supplying a fuel-air mixture to the internal combustion engine. A power control throttle valve 3 and a start valve 4 disposed upstream of the throttle valve 3, are provided in an intake passage 2 of the carburetor 1, and a start lever 6 acting on the start valve 4 is provided for operating the carburetor 1 in a starting stage. The start lever 6 is position-adjustable into an operating direction 7 and a lock release direction 8 independent of the operating direction 7. The start lever 6 is locked in a stationary position with respect to the operating direction 7, and after position-adjusted into the lock release direction 8 from the stationary position, the start lever 6 is released from lock so as to be position-adjustable in the operating direction 7. COPYRIGHT: (C)2006,JPO&NCIPI